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[red-knot] Emit errors for more AST nodes that are invalid (or only valid in specific contexts) in type expressions (#16822)

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## Summary

Add error messages for invalid nodes in type expressions

Fixes #16816 

## Test Plan

Extend annotations/invalid.md to handle these invalid AST nodes error
messages
This commit is contained in:
Matthew Mckee
2025-03-18 17:16:50 +00:00
committed by GitHub
parent a9f5dddbaa
commit ab3ec4de6a
2 changed files with 213 additions and 83 deletions
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47
crates/red_knot_python_semantic/resources/mdtest/annotations/invalid.md
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@@ -47,17 +47,60 @@ def _(
## Invalid AST nodes
```py
def bar() -> None:
return None
def _(
a: 1, # error: [invalid-type-form] "Int literals are not allowed in this context in a type expression"
b: 2.3, # error: [invalid-type-form] "Float literals are not allowed in type expressions"
c: 4j, # error: [invalid-type-form] "Complex literals are not allowed in type expressions"
d: True, # error: [invalid-type-form] "Boolean literals are not allowed in this context in a type expression"
# error: [invalid-type-form] "Bytes literals are not allowed in this context in a type expression"
e: int | b"foo",
e: int | b"foo", # error: [invalid-type-form] "Bytes literals are not allowed in this context in a type expression"
f: 1 and 2, # error: [invalid-type-form] "Boolean operations are not allowed in type expressions"
g: 1 or 2, # error: [invalid-type-form] "Boolean operations are not allowed in type expressions"
h: (foo := 1), # error: [invalid-type-form] "Named expressions are not allowed in type expressions"
i: not 1, # error: [invalid-type-form] "Unary operations are not allowed in type expressions"
j: lambda: 1, # error: [invalid-type-form] "`lambda` expressions are not allowed in type expressions"
k: 1 if True else 2, # error: [invalid-type-form] "`if` expressions are not allowed in type expressions"
l: await 1, # error: [invalid-type-form] "`await` expressions are not allowed in type expressions"
m: (yield 1), # error: [invalid-type-form] "`yield` expressions are not allowed in type expressions"
n: (yield from [1]), # error: [invalid-type-form] "`yield from` expressions are not allowed in type expressions"
o: 1 < 2, # error: [invalid-type-form] "Comparison expressions are not allowed in type expressions"
p: bar(), # error: [invalid-type-form] "Function calls are not allowed in type expressions"
q: int | f"foo", # error: [invalid-type-form] "F-strings are not allowed in type expressions"
r: [1, 2, 3][1:2], # error: [invalid-type-form] "Slices are not allowed in type expressions"
):
reveal_type(a) # revealed: Unknown
reveal_type(b) # revealed: Unknown
reveal_type(c) # revealed: Unknown
reveal_type(d) # revealed: Unknown
reveal_type(e) # revealed: int | Unknown
reveal_type(f) # revealed: Unknown
reveal_type(g) # revealed: Unknown
reveal_type(h) # revealed: Unknown
reveal_type(i) # revealed: Unknown
reveal_type(j) # revealed: Unknown
reveal_type(k) # revealed: Unknown
reveal_type(p) # revealed: Unknown
reveal_type(q) # revealed: int | Unknown
reveal_type(r) # revealed: @Todo(generics)
```
## Invalid Collection based AST nodes
```py
def _(
a: {1: 2}, # error: [invalid-type-form] "Dict literals are not allowed in type expressions"
b: {1, 2}, # error: [invalid-type-form] "Set literals are not allowed in type expressions"
c: {k: v for k, v in [(1, 2)]}, # error: [invalid-type-form] "Dict comprehensions are not allowed in type expressions"
d: [k for k in [1, 2]], # error: [invalid-type-form] "List comprehensions are not allowed in type expressions"
e: {k for k in [1, 2]}, # error: [invalid-type-form] "Set comprehensions are not allowed in type expressions"
f: (k for k in [1, 2]), # error: [invalid-type-form] "Generator expressions are not allowed in type expressions"
):
reveal_type(a) # revealed: Unknown
reveal_type(b) # revealed: Unknown
reveal_type(c) # revealed: Unknown
reveal_type(d) # revealed: Unknown
reveal_type(e) # revealed: Unknown
reveal_type(f) # revealed: Unknown
```